I'm sorry, but I just don't buy that.
Healing is already limited by the fact that it's all achieved through encounter and daily powers. Second wind is an encounter power. Healing word is an encounter power. Etc. Even if the PCs have unlimited healing surges, they are still limited to how many uses they can make per encounter. There are no truly at-will healing abilities (keeping in mind that Lay on Hands is limited to a number of daily uses).
I like the idea of healing surges having different values; I like that it's easier to heal the tank and harder to heal the wizard. I just don't see any reason why you should limit any particular character to being healed a particular number of times per day. The only healing that really matters, game-wise, is during combat, and there's already limits on that.
Add in the fact that they get an action point when they take an extended rest, and it just seems like the smart thing to do. There's no reason the PCs should ever not take an extended rest if the option is open to them.
I'm probably going to try out a house rule (posted about it
here) where there's no limit on healing surges, and after every encounter you gain an action point but after every extended rest you start with 0, so the first fight of the day is the only one you can't use an action point in.